CVE-2026-88091

Microsoft Windows 10 1607: unsafe deserialisation

Risk score: 74/100
CVSS: 7.8 v3.1
Exploit chance (30 days): 2.9%
Published: 13 Oct 2026

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What to know

What it is: Deserialization of untrusted data in Windows Management Instrumentation allows an authorized attacker to elevate privileges locally.
Affected: Microsoft Windows 10 1607
Fix: Apply the vendor's security update; see the linked advisory.
Exploitation: No known exploitation

Why it is Amber

CVSS 7.8 high
On your watchlist: windows server

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88091

Original description

Deserialization of untrusted data in Windows Management Instrumentation allows an authorized attacker to elevate privileges locally.

Last activity 13 Oct 2026. Patch Forecast updates every hour.